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Press Release (Mar 12,2011)
Occurrence of a Specific Incident Stipulated in Article 15, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness (Unit 4)
At 2:48PM on March 11th, the reactor of Fukushima Daini Nuclear Power 
Station Unit 1 (Boiling Water Reactor, rated output 1,100 Megawatts) shut 
down due to the impact of the earthquake.

Make-up Water Condensate System was used to inject water into the reactor 
to cool it.
Subsequently, at 6:07AM, the temperature of the suppression chamber 
exceeded 100 degrees. 
As the reactor pressure suppression function was lost, at 6:07AM, it was 
determined that a specific incident stipulated in article 15, clause 1 has 
occurred.

Safety and Impact to the Environment
- Currently, water level to cool irradiated fuels in the reactor is 
maintained.
- Indication of monitoring posts installed in the site boundary is not 
different from normal.  Currently, no radiation impact to the external 
environment has been confirmed.

We will continue monitoring in detail discharge of radioactive material 
from exhaust stack and discharge canal. 
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